Possible new pregnancy?

I miscarried around Feb 13th and bled for a week or two. Me and my partner did have unprotected sex a few times once the bleeding stopped and my period hasnt returned just yet. I noticed throughout last week that I have been tired more than usual again ( granted only getting 4-5 hours of sleep doesn't help ) and have days where I cant seem to keep anything down. I took a test ( the clinical guard one ) yesterday morning and got a very faint line so I ended up going to walgreens and grabbing their brand and got a bit of darker lines. Today I took a few more and the lines seem fainter again on the ones designed like easy home and clinical guard. When I first found out I was pregnant in January I took a 99 cent walmart test and it had a very faint line where it looked like it was an indent and as I later tested the lines got darker but they were clearblue branded ones. Idk if this is going to be the same and just a new pregnancy happening or if I may still have some hcg in my body and its a false positive so don't get my hopes up for nothing.